Riveting machine



May 24, 1927.

E. B. STIMPSON xxvzrxuo normas Filed Nov. 8. 1926 Passati May zza,v 1927.

rezago A UNETED STATESMPATENT OFFICE.

EDWIN B. s'rIMrsoN, OB BROOKLYN, NEW YORK, ASSIGNOB- tro EDWIN B. s'rrivrrsoN COMBANY,OF BROOKLYN, .NEW YORK. l

` f RIVBTING ivrAoI-irNE.4

Application filed November 8, 1926. Serial No. 146,934.

These objects, as willV appear hereinafter,

are accomplished by providing the so-ca'lled y pocket, in which individual rivets are segregated and held for the driving operation with structural features and conforma tions which constitute the present invention.

Other objects and aimsvof the invention, more or less broad than those stated above, together with the advantages inherent, will be in part obvious and in part specifically referred to in the course of the following description of the elements, combinations, arrangements of parts, and applications of principles constituting the invention; and the scope of protection contemplated will appear from the claim.

ln the accompanying drawings, which are to be takenas apart of this specification, and in which I have shown merely a preferred form of embodiment of my invention,

Figure 1 is an elevation showing parts of the rivet feeding, holding and driving mechanism of a rivetingy machine;

Figure 2 visV an elevation of the pocket;

Figure 3 is a section, with parts broken away and parts in elevation;

Figure 4 is a section taken on the line i t-t of Figure 3;

Figure 5 is ai section taken on the line 5-5 of Figure 3; and p v Figure 6 illustrates a. type of rivet for which my device is adapted.

Referring to the numerals on thedrawings there is shown at 7 a portion of the head of a riveting machine, in whichoperates a driving plunger 8. Rivets or staples 9 are fed by gravity which they are released one at a` time by a feed slide in the usual manner. holding, guiding and controlling members are located below and at thel end of the feed chute, beneath the plunger, and consists ofv a so-called pocket, comprising a pair lof `cooperating members 11 and 12, carriedat the lower ends of spring arms 13 and 14, shown as'seated in recesses 15 in the opposite down inclined chute 10, fromV The rivet sides of a portion of the head, and as held therein by a. boltlti which, for purposes'of ready Vvremovability, is shown equipped with a thumb-screw 17. This construction enables the pocketl members to yieldv during the pas sage of the rivet therethrough and to firmly hold the rivet during such passage. The pocket members have meeting flat surfaces 18, and each member is excavated so that when theilat surfaces are in contact, as in Figure 2, there exists a tubular` passage having an enlarged part defined by shoulders 19 and of a size such that it will receive the head of the rivet or staple; while below the head-receiving portion or seat 19a vertical passage extends, of size in cross-section very slightly smaller than the size of the staple head, and conforming generally to the shape ofsuch head. The'opposed faces of members 11 and 1 2 are cut so there are provided rends'walls against. which the'legs of the staple bear after the staple has been driven from the seat 19 down into the passage (see Figure 5), and side walls 2O (see Figure 5) against .which portions of the edge of the staple head bear. And beginningat a point l somewhat below seat 19A opposed faces of the members 11 and 12 are grooved, as indicated at 21, the grooves being so located and of such depth ,that thel projecting side points Or edges ofy thev staple head will nottouchthe bottoms of the grooves as the staple descends through the passage. These grooves 21 run all the wa'y to the lower ends of members 11 and 12, and at their upper ends gradually decrease in depth as they approach the short vertical surfaces 22 which separate them from the seats 19. The edges of the pocket members adjacent the end of the feed chute 1() are out away from the top and part way towards the lower ends thereof, providing an opening flaring loutwardly towards the feed chute and through which the legs of the staple pass asv the staple moves from the feed chute to the position shown in Figure 4, where the lhead rests on seat 19.

Operation.

As the lowermost staple in the feed chute is released by the feed slide it drops down` into position beneath the plunger, the head of the rivet seating itself on the ledge 19 and the Vlegs passing through the flaring opening of the pocket (Fig. 4).

As the plunger descends it engages thehead of the staple and forces the staple dovvn Wardly, thereby forcing apart the springpressed pocket members. In ease there are any burrs or unevennesses on the side points or edges of the rivet head, the grooves 21 will permit them to pass, so that the passage of the rivet may be under bet-ter control and not subject to interference by Way otl unequal friction on opposite sides of the rivet head, tipping, &C.

A poelet of the kind described comprising matching spring-pressed members formed to define between them a rivet-passage oblong in cross-section having` a surrounding` rivet-head ledge at its upper end and an outwardly llarng openingl into the side of the passage, the passage providing end-Walls for Contact With the ends of an oblong' rivethead and side-Walls for Contact With the sidel- Walls of the rivet head, said side-Walls, below the ledge being grooved all the Way to the lower end of the passage.

In testimony whereof I atlix my signature.

EDIVIN B. STIMPSON. 

